Agricultural salt, often referred to as coarse salt, is different from regular table salt. Its primary component is sodium chloride, but it also contains minerals like magnesium, potassium, sulfur, and trace elements such as boron and iodine, which are beneficial for plant growth. Although it is not a direct fertilizer, when used properly, it can significantly improve the yield and quality of certain crops that thrive in slightly saline conditions, such as sugar beets and celery.
When applied to these crops, the sodium ions in agricultural salt can replace potassium and magnesium ions that are adsorbed by soil colloids, making them more available for plant uptake. Additionally, chloride ions help suppress nitrifying bacteria in the soil, reducing nitrogen loss and preserving essential nutrients. The presence of magnesium, potassium, and other micronutrients further supports plant development.
However, it’s important to use agricultural salt wisely. Prolonged or excessive application, especially on rice fields, can lead to soil degradation. Sodium ions may disrupt the soil structure, causing cracks when dry and a sticky, compacted texture when wet. This reduces soil permeability and negatively affects long-term crop productivity.
Moreover, while sodium may benefit the current crop by replacing potassium, it can deplete the soil’s potassium reserves over time, leading to nutrient shortages for future crops. This makes the practice potentially harmful if not managed carefully.
Therefore, agricultural salt should be used as a supplementary fertilizer rather than a primary one. It is best applied in combination with organic fertilizers like compost or manure, ensuring balanced nutrition and sustainable soil health. A typical application rate is between 5 to 8 kilograms per acre, depending on soil conditions and crop needs.
It can be mixed with organic matter as a base fertilizer, used during transplanting, or applied as a top dressing. Always follow recommended guidelines to avoid overuse and maintain the long-term fertility of your land.
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